Disable paint invalidatin optimization about SVG transform change

Source/core/rendering/svg/RenderSVGModelObject.cpp

 /*
  * Copyright (c) 2009, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
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@@ skipping 131 matching lines @@
 void RenderSVGModelObject::invalidatePaintIfNeeded(const PaintInvalidationState& paintInvalidationState)
 {
     ForceHorriblySlowRectMapping slowRectMapping(&paintInvalidationState);
 
     const LayoutRect oldPaintInvalidationRect = previousPaintInvalidationRect();
     const LayoutPoint oldPositionFromPaintInvalidationContainer = previousPositionFromPaintInvalidationContainer();
     ASSERT(paintInvalidationState.paintInvalidationContainer() == containerForPaintInvalidation());
     setPreviousPaintInvalidationRect(boundsRectForPaintInvalidation(&paintInvalidationState.paintInvalidationContainer(), &paintInvalidationState));
     setPreviousPositionFromPaintInvalidationContainer(RenderLayer::positionFromPaintInvalidationContainer(this, &paintInvalidationState.paintInvalidationContainer(), &paintInvalidationState));
 
-    // If an ancestor container had its transform changed, then we just
-    // need to update the RenderSVGModelObject's repaint rect above. The invalidation
-    // will be handled by the container where the transform changed. This essentially
-    // means that we prune the entire branch for performance.
-    RenderObject* parent = this->parent();
-    if (parent && parent->isSVGContainer() && toRenderSVGContainer(parent)->didTransformToRootUpdate())
-        return;

[Julien - ping for review, 2014/07/28 18:05:27]

Actually, we should re-enable the ASSERT in RenderObject for SVG sub-trees in
RenderObject::assertSubtreeClearedPaintInvalidationState.

[Xianzhu, 2014/07/28 20:09:37]

Done.

-
     // If we are set to do a full paint invalidation that means the RenderView will be
     // issue paint invalidations. We can then skip issuing of paint invalidations for the child
     // renderers as they'll be covered by the RenderView.
     if (view()->doingFullRepaint())
         return;
 
     RenderObject::invalidatePaintIfNeeded(paintInvalidationState.paintInvalidationContainer(), oldPaintInvalidationRect, oldPositionFromPaintInvalidationContainer, paintInvalidationState);
 }
 
 } // namespace blink